Era
20th century
28
Civil War, 1936-1939
14
19th century
9
17th century
6
1918-1945
5
1933-1945
5
21st century
5
Revolution, 1789-1799
5
1889-1945
4
1918-1933
4
1517-1648
3
16th century
3
1789-1815
3
1871-1918
3
18th century
3
1917-1936
3
1939-1975
3
1945-1989
3
1989-
3
Philip III, 1598-1621
3
Revolution, 1917-1921
3
1517-1789
2
1599-1658
2
1642-1727
2
1725-1798
2
1769-1821
2
1872-1930
2
1949-
2
1949-1976
2
1976-
2
476-1492
2
711-1516
2
Charles I, 1625-1649
2
Charles II, 1665-1700
2
Civil War, 1642-1649
2
Napoleonic Conquest, 1808-1813
2
Primitive and early church, ca. 30-600
2
Republic, 1931-1939
2
-1576
1
121-180
1
1421-1737
1
1451-1504
1
1452-1516
1
1492-1517
1
1500-1558
1
1517-1882
1
1552-1625
1
1578-1621
1
1585-1642
1
1588-1679
1
more ...